I find the palace intrigue/drama around soccer coaches to be amusing. Are they paid just to be the ultimate scapegoat, or what's the deal?
Can't overly say why it matters as much for MLS, but at least for all other soccer leagues (so this mentality probably permeates from european leagues to the MLS) actual failure(s) in a league could mean relegation and since the manager is the one who determines line-ups and in game decisions, while yes, he can only be as good as the players he has, obvious on field play that is indicative of poor coaching gets magnified. Like if a team loses or draws a game due to VAR review or something that more easier to make it be
not the manager he can survive, if they lose cause they played sloppily or didn't put someone in who could've made a change earlier it is on the manager so they draw that ire.
Like, there is no "suck for Luck" mentality in the EPL, being in last (or least 3) means you're in the champions league, so that drive to be successful is very tangible even if for some outsiders "oh you don't have playoffs? or ties?" (harkening back to the original Ted Lasso's skit for NBC) might not see that. So it mean each game matters, a lot, and keeping up with the Jonses is how you have to play.